This is the Lynx Heli Blade Nano CP X "Stretch" Tail Boom Set. Lynx Heli Innovation has produced a "stretched" solid carbon fiber Nano CP X tail boom that is 15mm longer than the stock tail boom. This boom can be used on its own, and will deliver improved rigidity and increased tail performance. But when this boom is combined with the Lynx Stretch (LYX60958) or Bullet Stretch (LYX60958-SP) blades, it makes the Nano feel like a much larger bird, with performance that has to be felt to be believed.